Improvement in tool-holders for lathes



Toni-Homer for Lathes.

Patented Dec 31,1872.

{A y //jb INVENTOI? 'AM. PHOTU-LITHIJGRAPHIC CUJVJKDSBUHNZI'S PROCESS.)

CHARLES E. ALBRO, OF SYRACUSE, NEW YORK.

IMPRQVEMENT EN TQGL-HGLBERS FOR LATHES.

Specification forming part of Letters Patent No. 3 5,343, dated December 31, 1872.

To all whom "it may concern.-

Be it known that I, CHARLES EDWARD ALBRO, of Syracuse, Onondaga county, New York, have invented certain Improvements in Tool Chucks or Holders for holding tools for turning, threading-screws, or for other purposes where such a tool is applicable, of which the following is a specification:

My invention consists of a tool chuck or holder for holding tools made of thin strips of steel of proper width and form for the out tin g-edge ot' the tool at top, and made thinner for clearance at its lower edge, its depth bein g sufficient for the strength required, or its sides for some purposes may be parallel, the cross-section being the same throughout its entire length, by which I efi'ect a great economy of material and manufacture in properly forming the cutter, while I attain all the strength and firmness of a heavy shank, such as is re quired in tools of ordinary construction.

The construction is as follows: 1 take an oblong piece of metal, 13, Figure 1, and form a deep narrow groove, 22, therein, sufiicient to receive the tool 0, which is a straight narrow slip of steel of equal cross-section throughout its whole length, as clearly shown in the drawing 0, Fig. 1. This groove may be made with its sides parallel, or one side may be made inclined'equa-l to the gain desired for clearance, or wedge-shaped slips may be inserted in the parallel groove to give the tool inclination on the cuttingside, and in cases where the tool is thinner than the groove a slip of metal, 6, Fig. 2-, may be inserted beside it to properly fill the groove. On each side of the grooveb I chamfer oft the edge of the block B from end to end, so as to leave the surfaces inclined, as clearly shown-in the drawing, like a truncated wedge. Over this I fit a cap-piece, A, with a groove, d, Fig. 2, therein, which is a counterpart to the wedge-surface of the cutting-point for the work for which it is intended, and the inclined side for clearance in screw-cutting must be equal to the gain of the thread. It will be perceived that the tool-chuck can be made, as in the drawing, with both ends alike in form, so as to be reversed end for end in thetool-post, the tool also having a cuttingpoint formed on the opposite end. This will bring the clearance on the opposite side, and enable the workman to cut a right or left hand screw with the same tool by merely reversing ends.

I claim as my invention in the above-described tool- 1. T he tool chuck or holder, constructed sub stantially as and for the purposes herein set forth.

2. The employment of the wedges in the groove of the tool-holder for giving an inclination to the tool, as above specified.

3. The combination of the tool-chuck and tool, constructed and arranged substantially as above specified, for the purposes described.

CHAS. E. ALBRO.

Vv'itnesses:

J. J. GREENOUGH, STANLEY BAGG'. 

